Define thorium. thorium synonyms, thorium pronunciation, thorium translation, English dictionary definition of thorium. n. Symbol Th A radioactive silvery white metallic element that is recovered commercially from monazite. Its longest lived isotope, the only one that occurs...
A metallic element found in certain rare minerals, as thorite, pyrochlore, monazite, etc., and isolated as an infusible gray metallic powder which burns in the air and forms thoria; -- formerly called also
Noun
a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
n.
A metallic element found in certain rare minerals, as
thorite, pyrochlore, monazite, etc., and isolated as an infusible gray
metallic powder which burns in the air and forms thoria; -- formerly
called also thorinum. Symbol Th. Atomic weight 232.0.
Thorium
A metallic element found in certain rare minerals, as thorite, pyrochlore, monazite, etc., and isolated as an infusible gray metallic powder which burns in the air and forms thoria; -- formerly called also
Usage Examples
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